Yamaha EK40G, Service Manual, Page: 93 / 200

6H95G11 5-36
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Crankcase
Checking the crankshaft
1. Measure the crankshaft widths
a
and
b
.
Repair or disassemble the crankshaft if
out of specification.
2. Measure the connecting rod small end
axial play. Replace the bearing and con-
necting rod if above specification.
3. Measure the crankshaft runout. Repair or
disassemble the crankshaft if above
specification.
Installing the crankshaft bearings
1. Install the upper and lower bearings
using the bearing pressure C
1
and a
press.
NOTE:
9
Install the upper bearing so that the manu-
facture identification mark
a
faces the fly-
wheel magnet side.
9
Install the lower bearing so that the dowel
b
faces the flywheel magnet side.
2. Slowly turn the crankshaft and connect-
ing rods. If it does not turn smoothly, dis-
assemble the crankshaft and adjust or
replace any parts as necessary.
6B450800
6B450780
1
a
b
6B450790
c
c
c
Crankshaft width
a
:
61.40–61.45 mm
(2.4173–2.4193 in)
Crankshaft width
b
:
41.38–41.60 mm
(1.6291–1.6378 in)
Connecting rod small-end axial play
limit:
2.0 mm (0.08 in)
Crankshaft runout limit
c
:
0.03 mm (0.0012 in)
Bearing pressure C
1
:
90890-02393
Crankshaft aligner:
90890-03107
6H95G11_05 04.8.20 11:05 Page 37